Chemical industry is also called chemical processing industry. With the development of science and technology, it has gradually developed into a multi -industry and multi variety production department from the production of only a few inorganic products such as soda ash, sulfuric acid and organic products mainly extracted from plants to make dyes. It includes industrial, chemical, chemical and synthetic fiber. It is a department that uses chemical reaction to change the structure, composition and form of substances to produce chemical products. Such as: inorganic acid, alkali, salt, rare elements, synthetic fiber, plastic, synthetic rubber, dye, paint, pesticide, etc.